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Differential Regulation of Apoptosis in Normal Versus Transformed Mammary Epithelium by Lutein and Retinoic Acid1

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Differential Regulation of Apoptosis in Normal Versus Transformed Mammary Epithelium by Lutein and Retinoic Acid1 Vol. 9, 257–263, March 2000 Cancer Epidemiology, Biomarkers & Prevention 257 Differential Regulation of Apoptosis in Normal versus Transformed Mammary Epithelium by Lutein and Retinoic Acid1 Venil N. Sumantran, Rong Zhang, David S. Lee, and of considerable importance, because the therapeutic potential of Max S. Wicha2 these compounds depends on their selectivity in normal versus Department of Internal Medicine and Comprehensive Cancer Center, Cancer transformed cells. and Geriatrics Center, University of Michigan, Ann Arbor, Michigan Of the 600 known carotenoids, only 10% function as 48109-0942 vitamin A precursors in mammals (9). Therefore, understand- ing the role of nonprovitamin A carotenoids in cancer chemo- prevention is important. Although ␤-carotene and the nonpro- Abstract vitamin A carotenoid canthaxanthin have been shown to inhibit We examined the effects of all-trans retinoic acid (ATRA) mammary carcinogenesis in mouse and rat models (1–4), the and lutein (a nonprovitamin A carotenoid), on apoptosis molecular mechanisms of their chemopreventive action remain and chemosensitivity in primary normal human unknown. Thus far, the suggested mechanisms of anticancer mammary epithelial cells, SV40 transformed mammary action of carotenoids include singlet oxygen quenching, immu- cells, and MCF-7 human mammary carcinoma cells. noenhancement, protection against cellular mutagenesis, and ATRA and lutein selectively induced apoptosis in up-regulation of specific connexins (gap junction proteins; transformed but not normal human mammary cells. In Refs. 10–12). Thus, there is growing evidence suggesting that addition, both compounds protected normal cells, but not the chemopreventive properties of carotenoids are independent transformed cells, from apoptosis induced by the of the antioxidant activity of these compounds (13). chemotherapy agents etoposide and cisplatin. Lutein is a nonprovitamin A carotenoid found in broccoli Furthermore, lutein and ATRA selectively increased the and spinach. Lutein has chemopreventive activity in mouse ratio of Bcl-xL:Bax protein expression in normal cells but models of murine breast and colon cancers (14, 15). It has been not transformed mammary cells, suggesting a possible suggested that lutein, as well as another carotenoid, zeaxanthin, mechanism for selective modulation of apoptosis. The can account for part of the decreased breast cancer risk for differential effects of lutein and ATRA on apoptotic women on high vegetable and fiber diets (2–4). Dietary lutein pathways in normal versus transformed mammary was associated with decreased breast cancer risk and estrogen epithelial cells may have important implications for receptor-positive status in premenopausal disease (16). chemoprevention and therapy. We examined the effects of both a retinoid, ATRA,3 and lutein on modulation of apoptotic pathways in normal human Introduction mammary epithelial cells as well as similar cells transformed with SV40. The latter cells have inactivated p53 and pRB There have been a number of investigations demonstrating the proteins (17). We also examined the effects of ATRA and lutein chemoprotective effects of selected retinoids and carotenoids. on MCF-7 cells. These cells are a fully transformed human This has been demonstrated in animal tumor models as well as mammary carcinoma cell line with wild-type p53 and high in epidemiological studies in humans (1–4). The molecular levels of Bcl-2 (18). In this study, we demonstrate the differ- mechanisms responsible for these protective effects are unclear. ential effects of these compounds on apoptosis and chemosen- However, one mechanism suggested for effects of retinoids on sitivity in normal versus transformed mammary cells. In addi- carcinogenesis involves the ability of these compounds to in- tion, we examined the effects of these compounds on duce apoptosis or programmed cell death in epithelial tumor expression of members of the Bcl-2 protein family. We report cells (5, 6). All-trans retinoic acid has been shown to induce that ATRA and lutein have differential effects on the apoptotic significant levels of apoptosis in breast, ovarian, and squamous threshold of normal versus transformed mammary cells and are carcinoma cells and can sensitize tumor cells to chemotherapy- associated with changes in expression of bcl-2 family members. induced apoptosis (5–8). Retinoids given at the high concen- These experiments have important implications for understand- trations necessary to achieve this effect, however, are toxic (5, ing the role of ATRA and lutein in chemoprevention and for 6). There have been fewer studies investigating the effects of developing strategies to increase the therapeutic index of cancer retinoids and carotenoids on normal breast epithelium. This is treatments. Materials and Methods Received 6/21/99; revised 11/10/99; accepted 12/17/99. Reagents. ATRA and lutein were purchased from Sigma The costs of publication of this article were defrayed in part by the payment of Chemical Co. (St. Louis, MO) and Kemin Industries (Des page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. 1 This work was supported by NIH Grants CA 61777-01 and CA 66233. 2 To whom requests for reprints should be addressed, at Department of Internal Medicine and Comprehensive Cancer Center, Room 6302, Cancer and Geriatrics 3 The abbreviations used are: ATRA, all-trans retinoic acid; THF, tetrahydrofu- Center, University of Michigan, Ann Arbor, MI 48109-0942. Phone: (734) 936- ran; MSU-1, Michigan State University-1 medium; SRF, serum replacement 1831; Fax: (734) 615-3947; E-mail: [email protected]. factor; PI, propidium iodide; CDDP, cisplatin. Downloaded from cebp.aacrjournals.org on September 23, 2021. © 2000 American Association for Cancer Research. 258 Differential Effects of Lutein on Normal versus Tumor Cells Table 1 Effects of lutein and ATRA on apoptosis in normal versus transformed human mammary epithelial cells The normal cells, SV40-transformed cells, and MCF-7 tumor cells were grown in the presence of ATRA or lutein for 4 days. Apoptosis was quantitated after staining cells with PI. For each cell type, the values for the percentage of PI-positive cells should be compared with the corresponding value in the control (THF) sample. No significant increase in PI staining was observed in normal mammary cells treated with ATRA or lutein. In SV40-transformed cells, only ATRA (1.0 ␮M) significantly increased staining (n ϭ 2; P ϭ 0.028). In MCF-7 tumor cells, PI staining was significantly increased by ATRA (n ϭ 3; P ϭ 0.038 for both concentrations) and lutein (n ϭ 3; P ϭ 0.016) relative to that in the control (THF). % of cells stained with PI (ϮSD) Normal mammary SV40-transformed MCF-7 breast cancer Sample cells cells cells THF 3.90 (1.00) 13.00 (2.00) 5.20 (1.10) 0.10 ␮M ATRA 4.80 (0.50) 26.50 (4.50) 16.10 (2.90) 1.0 ␮M ATRA 4.40 (0.30) 21.50 (0.50) 16.00 (3.00) Lutein 5.30 (1.00) 19.50 (7.50) 13.60 (1.05) Fig. 1. Effects of ATRA and lutein on viability of normal and transformed mammary cells. Cell viability was measured on day 4 for each cell type. The graph shows the percentage of viable cells in ATRA- or lutein-treated samples Measurement of Apoptosis. Apoptosis was assessed by mon- with respect to the THF control for a given cell type. ATRA (1.0 ␮M) significantly decreased the viability of normal mammary cells with respect to the THF control itoring nuclear morphology after staining cells with PI, as (35% decrease; n ϭ 6; P ϭ 0.005). Both ATRA concentrations caused a signif- described (22). The Cell Death ELISA was performed as de- icant (30%) decrease in viability of MCF-7 tumor cells (n ϭ 6, P ϭ 0.001 for 0.10 scribed (23). ␮M; and n ϭ 3, P ϭ 0.004 for 1.0 ␮M). Lutein induced a significant decrease (17%) in viability of MCF-7 tumor cells (n ϭ 6, P ϭ 0.002). Ⅺ, normal cells; 2, Western Blotting. After 4 days of treatment with and without SV40-transformed cells; f, MCF-7 tumor cells. Bars, SD. THF, lutein, or ATRA, total lysates were prepared from at- tached and detached cells of each cell type. The Bradford assay was used to quantitate total protein within each sample. For normal cells, 20 ␮g of total protein of each sample were loaded Moines, IA), respectively. Each compound was dissolved in per lane. For tumor cells, 50 ␮g of total protein from each THF (99.9%; Aldrich Chemicals, Milwaukee, WI; Ref. 15), sample were loaded per lane. Selected blots were reprobed with which was stored under N2 gas and sealed to prevent peroxide an actin antibody to ensure equal loading of lanes. formation. Crystalline ATRA and lutein were stored in the dark Ϫ ␮ Western blot analysis was done as described (23), with at 20°C. Lutein was used at a final concentration of 7 M, antibodies to human Bcl-2, Bcl-xL, or Bax. The mouse mono- based on levels reported in sera of human subjects (19, 20). ␮ clonal Bcl-2 antibody and Rabbit polyclonal antibodies against ATRA was used at final concentrations of 0.10 and 1.0 M. human-Bcl-x were from Dako Corp. (Carpinteria, CA) and Stock solutions of ATRA and lutein (500-fold in THF) were Transduction Laboratories (Lexington, KY), respectively. The prepared for each experiment such that the final THF concen- mouse monoclonal antibody against human Bax and the goat tration in lutein/ATRA-treated samples was 0.20%. Control antimouse/antirabbit antibodies conjugated to horseradish per- samples were treated with THF alone (0.20%). oxidase were from PharMingen (San Diego, CA) and Ameresco Cell Culture. Normal human mammary epithelial cells were Corp. (Solon, OH), respectively. A chemiluminescence kit derived from reduction mammoplasties as described (21). Nor- (Amersham, Arlington Heights, IL) was used to visualize pro- mal mammary cells were cultured in MSU-1 medium ϩ 5% tein bands.
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